In this study, performance parameters of a diesel engine were investigated using biodiesel fuel. Maximum
cylinder pressure and exhaust gas temperatures increased with increasing biodiesel percentage in diesel-biodiesel
fuel blends up to 40% (B0-B40), but with increasing of biodiesel fuel percentage beyond B40 (B40-B100),
the maximum cylinder pressure decreased. Brake power was constant for all blend ratio at the constant engine
load this is due to this fact that engine speed was adjusted at constant value (730 rpm). Fuel consumption
and brake specific fuel consumption decreased with increasing of biodiesel percentage in diesel-biodiesel fuel
blends up to 40% (B0-B40), but with increasing biodiesel fuel percentage higher than B40 (B40-B100), these
variables were increased. So, it was concluded that fuel blends with 40% biodiesel is an optimum fuel regime
and it has been recommended for stationary diesel engines. Results indicated that with increasing engine load,
fuel consumption increases. B40 (40% biodiesel, 60% diesel fuel) resulted in the minimum brake specific fuel
consumption. Air consumption for all levels of engine load and fuel blends was constant and little deviations
were due to changing in laboratory ambient temperature. Air to fuel ratio (A/F) increased from B0 to B40 and
it decreased from B40 to B100. Maximum magnitude of A/F ratio for different diesel- biodiesel fuel blends was
observed at B40.